fs/cifs/cifsencrypt.c

   1 /*
   2  *   fs/cifs/cifsencrypt.c
   3  *
   4  *   Encryption and hashing operations relating to NTLM, NTLMv2.  See MS-NLMP
   5  *   for more detailed information
   6  *
   7  *   Copyright (C) International Business Machines  Corp., 2005,2013
   8  *   Author(s): Steve French (sfrench@us.ibm.com)
   9  *
  10  *   This library is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU Lesser General Public License as published
  12  *   by the Free Software Foundation; either version 2.1 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This library is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  18  *   the GNU Lesser General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU Lesser General Public License
  21  *   along with this library; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_unicode.h"
  31 #include "cifsproto.h"
  32 #include "ntlmssp.h"
  33 #include <linux/ctype.h>
  34 #include <linux/random.h>
  35 #include <linux/highmem.h>
  36
  37 static int
  38 cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
  39 {
  40         int rc;
  41         unsigned int size;
  42
  43         if (server->secmech.sdescmd5 != NULL)
  44                 return 0; /* already allocated */
  45
  46         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
  47         if (IS_ERR(server->secmech.md5)) {
  48                 cifs_dbg(VFS, "could not allocate crypto md5\n");
  49                 rc = PTR_ERR(server->secmech.md5);
  50                 server->secmech.md5 = NULL;
  51                 return rc;
  52         }
  53
  54         size = sizeof(struct shash_desc) +
  55                         crypto_shash_descsize(server->secmech.md5);
  56         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
  57         if (!server->secmech.sdescmd5) {
  58                 crypto_free_shash(server->secmech.md5);
  59                 server->secmech.md5 = NULL;
  60                 return -ENOMEM;
  61         }
  62         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
  63         server->secmech.sdescmd5->shash.flags = 0x0;
  64
  65         return 0;
  66 }
  67
  68 /*
  69  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  70  * The 16 byte signature must be allocated by the caller. Note we only use the
  71  * 1st eight bytes and that the smb header signature field on input contains
  72  * the sequence number before this function is called. Also, this function
  73  * should be called with the server->srv_mutex held.
  74  */
  75 static int cifs_calc_signature(struct smb_rqst *rqst,
  76                         struct TCP_Server_Info *server, char *signature)
  77 {
  78         int i;
  79         int rc;
  80         struct kvec *iov = rqst->rq_iov;
  81         int n_vec = rqst->rq_nvec;
  82
  83         if (iov == NULL || signature == NULL || server == NULL)
  84                 return -EINVAL;
  85
  86         if (!server->secmech.sdescmd5) {
  87                 rc = cifs_crypto_shash_md5_allocate(server);
  88                 if (rc) {
  89                         cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
  90                         return -1;
  91                 }
  92         }
  93
  94         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  95         if (rc) {
  96                 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
  97                 return rc;
  98         }
  99
 100         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 101                 server->session_key.response, server->session_key.len);
 102         if (rc) {
 103                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 104                 return rc;
 105         }
 106
 107         for (i = 0; i < n_vec; i++) {
 108                 if (iov[i].iov_len == 0)
 109                         continue;
 110                 if (iov[i].iov_base == NULL) {
 111                         cifs_dbg(VFS, "null iovec entry\n");
 112                         return -EIO;
 113                 }
 114                 /* The first entry includes a length field (which does not get
 115                    signed that occupies the first 4 bytes before the header */
 116                 if (i == 0) {
 117                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 118                                 break; /* nothing to sign or corrupt header */
 119                         rc =
 120                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 121                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 122                 } else {
 123                         rc =
 124                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 125                                 iov[i].iov_base, iov[i].iov_len);
 126                 }
 127                 if (rc) {
 128                         cifs_dbg(VFS, "%s: Could not update with payload\n",
 129                                  __func__);
 130                         return rc;
 131                 }
 132         }
 133
 134         /* now hash over the rq_pages array */
 135         for (i = 0; i < rqst->rq_npages; i++) {
 136                 struct kvec p_iov;
 137
 138                 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
 139                 crypto_shash_update(&server->secmech.sdescmd5->shash,
 140                                         p_iov.iov_base, p_iov.iov_len);
 141                 kunmap(rqst->rq_pages[i]);
 142         }
 143
 144         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 145         if (rc)
 146                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 147
 148         return rc;
 149 }
 150
 151 /* must be called with server->srv_mutex held */
 152 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 153                    __u32 *pexpected_response_sequence_number)
 154 {
 155         int rc = 0;
 156         char smb_signature[20];
 157         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 158
 159         if ((cifs_pdu == NULL) || (server == NULL))
 160                 return -EINVAL;
 161
 162         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 163             server->tcpStatus == CifsNeedNegotiate)
 164                 return rc;
 165
 166         if (!server->session_estab) {
 167                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 168                 return rc;
 169         }
 170
 171         cifs_pdu->Signature.Sequence.SequenceNumber =
 172                                 cpu_to_le32(server->sequence_number);
 173         cifs_pdu->Signature.Sequence.Reserved = 0;
 174
 175         *pexpected_response_sequence_number = ++server->sequence_number;
 176         ++server->sequence_number;
 177
 178         rc = cifs_calc_signature(rqst, server, smb_signature);
 179         if (rc)
 180                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 181         else
 182                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 183
 184         return rc;
 185 }
 186
 187 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 188                    __u32 *pexpected_response_sequence)
 189 {
 190         struct smb_rqst rqst = { .rq_iov = iov,
 191                                  .rq_nvec = n_vec };
 192
 193         return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 194 }
 195
 196 /* must be called with server->srv_mutex held */
 197 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 198                   __u32 *pexpected_response_sequence_number)
 199 {
 200         struct kvec iov;
 201
 202         iov.iov_base = cifs_pdu;
 203         iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
 204
 205         return cifs_sign_smbv(&iov, 1, server,
 206                               pexpected_response_sequence_number);
 207 }
 208
 209 int cifs_verify_signature(struct smb_rqst *rqst,
 210                           struct TCP_Server_Info *server,
 211                           __u32 expected_sequence_number)
 212 {
 213         unsigned int rc;
 214         char server_response_sig[8];
 215         char what_we_think_sig_should_be[20];
 216         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 217
 218         if (cifs_pdu == NULL || server == NULL)
 219                 return -EINVAL;
 220
 221         if (!server->session_estab)
 222                 return 0;
 223
 224         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 225                 struct smb_com_lock_req *pSMB =
 226                         (struct smb_com_lock_req *)cifs_pdu;
 227             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 228                         return 0;
 229         }
 230
 231         /* BB what if signatures are supposed to be on for session but
 232            server does not send one? BB */
 233
 234         /* Do not need to verify session setups with signature "BSRSPYL "  */
 235         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 236                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 237                          cifs_pdu->Command);
 238
 239         /* save off the origiginal signature so we can modify the smb and check
 240                 its signature against what the server sent */
 241         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 242
 243         cifs_pdu->Signature.Sequence.SequenceNumber =
 244                                         cpu_to_le32(expected_sequence_number);
 245         cifs_pdu->Signature.Sequence.Reserved = 0;
 246
 247         mutex_lock(&server->srv_mutex);
 248         rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 249         mutex_unlock(&server->srv_mutex);
 250
 251         if (rc)
 252                 return rc;
 253
 254 /*      cifs_dump_mem("what we think it should be: ",
 255                       what_we_think_sig_should_be, 16); */
 256
 257         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 258                 return -EACCES;
 259         else
 260                 return 0;
 261
 262 }
 263
 264 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 265 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 266 {
 267         int rc = 0;
 268         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 269         char temp_key[CIFS_SESS_KEY_SIZE];
 270
 271         if (!ses)
 272                 return -EINVAL;
 273
 274         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 275         if (!ses->auth_key.response)
 276                 return -ENOMEM;
 277
 278         ses->auth_key.len = temp_len;
 279
 280         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 281                         ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 282         if (rc) {
 283                 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
 284                          __func__, rc);
 285                 return rc;
 286         }
 287
 288         rc = E_md4hash(ses->password, temp_key, nls_cp);
 289         if (rc) {
 290                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
 291                          __func__, rc);
 292                 return rc;
 293         }
 294
 295         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 296         if (rc)
 297                 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
 298                          __func__, rc);
 299
 300         return rc;
 301 }
 302
 303 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 304 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 305                         char *lnm_session_key)
 306 {
 307         int i;
 308         int rc;
 309         char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
 310
 311         if (password)
 312                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 313
 314         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 315                 memcpy(lnm_session_key, password_with_pad,
 316                         CIFS_ENCPWD_SIZE);
 317                 return 0;
 318         }
 319
 320         /* calculate old style session key */
 321         /* calling toupper is less broken than repeatedly
 322         calling nls_toupper would be since that will never
 323         work for UTF8, but neither handles multibyte code pages
 324         but the only alternative would be converting to UCS-16 (Unicode)
 325         (using a routine something like UniStrupr) then
 326         uppercasing and then converting back from Unicode - which
 327         would only worth doing it if we knew it were utf8. Basically
 328         utf8 and other multibyte codepages each need their own strupper
 329         function since a byte at a time will ont work. */
 330
 331         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 332                 password_with_pad[i] = toupper(password_with_pad[i]);
 333
 334         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 335
 336         return rc;
 337 }
 338 #endif /* CIFS_WEAK_PW_HASH */
 339
 340 /* Build a proper attribute value/target info pairs blob.
 341  * Fill in netbios and dns domain name and workstation name
 342  * and client time (total five av pairs and + one end of fields indicator.
 343  * Allocate domain name which gets freed when session struct is deallocated.
 344  */
 345 static int
 346 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 347 {
 348         unsigned int dlen;
 349         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 350         char *defdmname = "WORKGROUP";
 351         unsigned char *blobptr;
 352         struct ntlmssp2_name *attrptr;
 353
 354         if (!ses->domainName) {
 355                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 356                 if (!ses->domainName)
 357                         return -ENOMEM;
 358         }
 359
 360         dlen = strlen(ses->domainName);
 361
 362         /*
 363          * The length of this blob is two times the size of a
 364          * structure (av pair) which holds name/size
 365          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 366          * unicode length of a netbios domain name
 367          */
 368         ses->auth_key.len = size + 2 * dlen;
 369         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 370         if (!ses->auth_key.response) {
 371                 ses->auth_key.len = 0;
 372                 return -ENOMEM;
 373         }
 374
 375         blobptr = ses->auth_key.response;
 376         attrptr = (struct ntlmssp2_name *) blobptr;
 377
 378         /*
 379          * As defined in MS-NTLM 3.3.2, just this av pair field
 380          * is sufficient as part of the temp
 381          */
 382         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 383         attrptr->length = cpu_to_le16(2 * dlen);
 384         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 385         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 386
 387         return 0;
 388 }
 389
 390 /* Server has provided av pairs/target info in the type 2 challenge
 391  * packet and we have plucked it and stored within smb session.
 392  * We parse that blob here to find netbios domain name to be used
 393  * as part of ntlmv2 authentication (in Target String), if not already
 394  * specified on the command line.
 395  * If this function returns without any error but without fetching
 396  * domain name, authentication may fail against some server but
 397  * may not fail against other (those who are not very particular
 398  * about target string i.e. for some, just user name might suffice.
 399  */
 400 static int
 401 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 402 {
 403         unsigned int attrsize;
 404         unsigned int type;
 405         unsigned int onesize = sizeof(struct ntlmssp2_name);
 406         unsigned char *blobptr;
 407         unsigned char *blobend;
 408         struct ntlmssp2_name *attrptr;
 409
 410         if (!ses->auth_key.len || !ses->auth_key.response)
 411                 return 0;
 412
 413         blobptr = ses->auth_key.response;
 414         blobend = blobptr + ses->auth_key.len;
 415
 416         while (blobptr + onesize < blobend) {
 417                 attrptr = (struct ntlmssp2_name *) blobptr;
 418                 type = le16_to_cpu(attrptr->type);
 419                 if (type == NTLMSSP_AV_EOL)
 420                         break;
 421                 blobptr += 2; /* advance attr type */
 422                 attrsize = le16_to_cpu(attrptr->length);
 423                 blobptr += 2; /* advance attr size */
 424                 if (blobptr + attrsize > blobend)
 425                         break;
 426                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 427                         if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
 428                                 break;
 429                         if (!ses->domainName) {
 430                                 ses->domainName =
 431                                         kmalloc(attrsize + 1, GFP_KERNEL);
 432                                 if (!ses->domainName)
 433                                                 return -ENOMEM;
 434                                 cifs_from_utf16(ses->domainName,
 435                                         (__le16 *)blobptr, attrsize, attrsize,
 436                                         nls_cp, NO_MAP_UNI_RSVD);
 437                                 break;
 438                         }
 439                 }
 440                 blobptr += attrsize; /* advance attr  value */
 441         }
 442
 443         return 0;
 444 }
 445
 446 /* Server has provided av pairs/target info in the type 2 challenge
 447  * packet and we have plucked it and stored within smb session.
 448  * We parse that blob here to find the server given timestamp
 449  * as part of ntlmv2 authentication (or local current time as
 450  * default in case of failure)
 451  */
 452 static __le64
 453 find_timestamp(struct cifs_ses *ses)
 454 {
 455         unsigned int attrsize;
 456         unsigned int type;
 457         unsigned int onesize = sizeof(struct ntlmssp2_name);
 458         unsigned char *blobptr;
 459         unsigned char *blobend;
 460         struct ntlmssp2_name *attrptr;
 461
 462         if (!ses->auth_key.len || !ses->auth_key.response)
 463                 return 0;
 464
 465         blobptr = ses->auth_key.response;
 466         blobend = blobptr + ses->auth_key.len;
 467
 468         while (blobptr + onesize < blobend) {
 469                 attrptr = (struct ntlmssp2_name *) blobptr;
 470                 type = le16_to_cpu(attrptr->type);
 471                 if (type == NTLMSSP_AV_EOL)
 472                         break;
 473                 blobptr += 2; /* advance attr type */
 474                 attrsize = le16_to_cpu(attrptr->length);
 475                 blobptr += 2; /* advance attr size */
 476                 if (blobptr + attrsize > blobend)
 477                         break;
 478                 if (type == NTLMSSP_AV_TIMESTAMP) {
 479                         if (attrsize == sizeof(u64))
 480                                 return *((__le64 *)blobptr);
 481                 }
 482                 blobptr += attrsize; /* advance attr value */
 483         }
 484
 485         return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 486 }
 487
 488 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 489                             const struct nls_table *nls_cp)
 490 {
 491         int rc = 0;
 492         int len;
 493         char nt_hash[CIFS_NTHASH_SIZE];
 494         __le16 *user;
 495         wchar_t *domain;
 496         wchar_t *server;
 497
 498         if (!ses->server->secmech.sdeschmacmd5) {
 499                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 500                 return -1;
 501         }
 502
 503         /* calculate md4 hash of password */
 504         E_md4hash(ses->password, nt_hash, nls_cp);
 505
 506         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 507                                 CIFS_NTHASH_SIZE);
 508         if (rc) {
 509                 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
 510                 return rc;
 511         }
 512
 513         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 514         if (rc) {
 515                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 516                 return rc;
 517         }
 518
 519         /* convert ses->user_name to unicode */
 520         len = ses->user_name ? strlen(ses->user_name) : 0;
 521         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 522         if (user == NULL) {
 523                 rc = -ENOMEM;
 524                 return rc;
 525         }
 526
 527         if (len) {
 528                 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
 529                 UniStrupr(user);
 530         } else {
 531                 memset(user, '\0', 2);
 532         }
 533
 534         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 535                                 (char *)user, 2 * len);
 536         kfree(user);
 537         if (rc) {
 538                 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
 539                 return rc;
 540         }
 541
 542         /* convert ses->domainName to unicode and uppercase */
 543         if (ses->domainName) {
 544                 len = strlen(ses->domainName);
 545
 546                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 547                 if (domain == NULL) {
 548                         rc = -ENOMEM;
 549                         return rc;
 550                 }
 551                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 552                                       nls_cp);
 553                 rc =
 554                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 555                                         (char *)domain, 2 * len);
 556                 kfree(domain);
 557                 if (rc) {
 558                         cifs_dbg(VFS, "%s: Could not update with domain\n",
 559                                  __func__);
 560                         return rc;
 561                 }
 562         } else {
 563                 /* We use ses->serverName if no domain name available */
 564                 len = strlen(ses->serverName);
 565
 566                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 567                 if (server == NULL) {
 568                         rc = -ENOMEM;
 569                         return rc;
 570                 }
 571                 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 572                                         nls_cp);
 573                 rc =
 574                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 575                                         (char *)server, 2 * len);
 576                 kfree(server);
 577                 if (rc) {
 578                         cifs_dbg(VFS, "%s: Could not update with server\n",
 579                                  __func__);
 580                         return rc;
 581                 }
 582         }
 583
 584         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 585                                         ntlmv2_hash);
 586         if (rc)
 587                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 588
 589         return rc;
 590 }
 591
 592 static int
 593 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 594 {
 595         int rc;
 596         struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
 597             (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 598         unsigned int hash_len;
 599
 600         /* The MD5 hash starts at challenge_key.key */
 601         hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
 602                 offsetof(struct ntlmv2_resp, challenge.key[0]));
 603
 604         if (!ses->server->secmech.sdeschmacmd5) {
 605                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 606                 return -1;
 607         }
 608
 609         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 610                                  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 611         if (rc) {
 612                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 613                          __func__);
 614                 return rc;
 615         }
 616
 617         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 618         if (rc) {
 619                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 620                 return rc;
 621         }
 622
 623         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
 624                 memcpy(ntlmv2->challenge.key,
 625                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 626         else
 627                 memcpy(ntlmv2->challenge.key,
 628                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 629         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 630                                  ntlmv2->challenge.key, hash_len);
 631         if (rc) {
 632                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 633                 return rc;
 634         }
 635
 636         /* Note that the MD5 digest over writes anon.challenge_key.key */
 637         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 638                                 ntlmv2->ntlmv2_hash);
 639         if (rc)
 640                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 641
 642         return rc;
 643 }
 644
 645 static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
 646 {
 647         int rc;
 648         unsigned int size;
 649
 650         /* check if already allocated */
 651         if (server->secmech.sdeschmacmd5)
 652                 return 0;
 653
 654         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 655         if (IS_ERR(server->secmech.hmacmd5)) {
 656                 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
 657                 rc = PTR_ERR(server->secmech.hmacmd5);
 658                 server->secmech.hmacmd5 = NULL;
 659                 return rc;
 660         }
 661
 662         size = sizeof(struct shash_desc) +
 663                         crypto_shash_descsize(server->secmech.hmacmd5);
 664         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 665         if (!server->secmech.sdeschmacmd5) {
 666                 crypto_free_shash(server->secmech.hmacmd5);
 667                 server->secmech.hmacmd5 = NULL;
 668                 return -ENOMEM;
 669         }
 670         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 671         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 672
 673         return 0;
 674 }
 675
 676 int
 677 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 678 {
 679         int rc;
 680         int baselen;
 681         unsigned int tilen;
 682         struct ntlmv2_resp *ntlmv2;
 683         char ntlmv2_hash[16];
 684         unsigned char *tiblob = NULL; /* target info blob */
 685         __le64 rsp_timestamp;
 686
 687         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
 688                 if (!ses->domainName) {
 689                         rc = find_domain_name(ses, nls_cp);
 690                         if (rc) {
 691                                 cifs_dbg(VFS, "error %d finding domain name\n",
 692                                          rc);
 693                                 goto setup_ntlmv2_rsp_ret;
 694                         }
 695                 }
 696         } else {
 697                 rc = build_avpair_blob(ses, nls_cp);
 698                 if (rc) {
 699                         cifs_dbg(VFS, "error %d building av pair blob\n", rc);
 700                         goto setup_ntlmv2_rsp_ret;
 701                 }
 702         }
 703
 704         /* Must be within 5 minutes of the server (or in range +/-2h
 705          * in case of Mac OS X), so simply carry over server timestamp
 706          * (as Windows 7 does)
 707          */
 708         rsp_timestamp = find_timestamp(ses);
 709
 710         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 711         tilen = ses->auth_key.len;
 712         tiblob = ses->auth_key.response;
 713
 714         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 715         if (!ses->auth_key.response) {
 716                 rc = -ENOMEM;
 717                 ses->auth_key.len = 0;
 718                 goto setup_ntlmv2_rsp_ret;
 719         }
 720         ses->auth_key.len += baselen;
 721
 722         ntlmv2 = (struct ntlmv2_resp *)
 723                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 724         ntlmv2->blob_signature = cpu_to_le32(0x00000101);
 725         ntlmv2->reserved = 0;
 726         ntlmv2->time = rsp_timestamp;
 727
 728         get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
 729         ntlmv2->reserved2 = 0;
 730
 731         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 732
 733         mutex_lock(&ses->server->srv_mutex);
 734
 735         rc = crypto_hmacmd5_alloc(ses->server);
 736         if (rc) {
 737                 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
 738                 goto unlock;
 739         }
 740
 741         /* calculate ntlmv2_hash */
 742         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 743         if (rc) {
 744                 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
 745                 goto unlock;
 746         }
 747
 748         /* calculate first part of the client response (CR1) */
 749         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 750         if (rc) {
 751                 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
 752                 goto unlock;
 753         }
 754
 755         /* now calculate the session key for NTLMv2 */
 756         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 757                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 758         if (rc) {
 759                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 760                          __func__);
 761                 goto unlock;
 762         }
 763
 764         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 765         if (rc) {
 766                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 767                 goto unlock;
 768         }
 769
 770         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 771                 ntlmv2->ntlmv2_hash,
 772                 CIFS_HMAC_MD5_HASH_SIZE);
 773         if (rc) {
 774                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 775                 goto unlock;
 776         }
 777
 778         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 779                 ses->auth_key.response);
 780         if (rc)
 781                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 782
 783 unlock:
 784         mutex_unlock(&ses->server->srv_mutex);
 785 setup_ntlmv2_rsp_ret:
 786         kfree(tiblob);
 787
 788         return rc;
 789 }
 790
 791 int
 792 calc_seckey(struct cifs_ses *ses)
 793 {
 794         int rc;
 795         struct crypto_blkcipher *tfm_arc4;
 796         struct scatterlist sgin, sgout;
 797         struct blkcipher_desc desc;
 798         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 799
 800         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 801
 802         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 803         if (IS_ERR(tfm_arc4)) {
 804                 rc = PTR_ERR(tfm_arc4);
 805                 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
 806                 return rc;
 807         }
 808
 809         desc.tfm = tfm_arc4;
 810
 811         rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 812                                         CIFS_SESS_KEY_SIZE);
 813         if (rc) {
 814                 cifs_dbg(VFS, "%s: Could not set response as a key\n",
 815                          __func__);
 816                 return rc;
 817         }
 818
 819         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 820         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 821
 822         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 823         if (rc) {
 824                 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
 825                 crypto_free_blkcipher(tfm_arc4);
 826                 return rc;
 827         }
 828
 829         /* make secondary_key/nonce as session key */
 830         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 831         /* and make len as that of session key only */
 832         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 833
 834         crypto_free_blkcipher(tfm_arc4);
 835
 836         return rc;
 837 }
 838
 839 void
 840 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 841 {
 842         if (server->secmech.cmacaes) {
 843                 crypto_free_shash(server->secmech.cmacaes);
 844                 server->secmech.cmacaes = NULL;
 845         }
 846
 847         if (server->secmech.hmacsha256) {
 848                 crypto_free_shash(server->secmech.hmacsha256);
 849                 server->secmech.hmacsha256 = NULL;
 850         }
 851
 852         if (server->secmech.md5) {
 853                 crypto_free_shash(server->secmech.md5);
 854                 server->secmech.md5 = NULL;
 855         }
 856
 857         if (server->secmech.hmacmd5) {
 858                 crypto_free_shash(server->secmech.hmacmd5);
 859                 server->secmech.hmacmd5 = NULL;
 860         }
 861
 862         kfree(server->secmech.sdesccmacaes);
 863         server->secmech.sdesccmacaes = NULL;
 864         kfree(server->secmech.sdeschmacsha256);
 865         server->secmech.sdeschmacsha256 = NULL;
 866         kfree(server->secmech.sdeschmacmd5);
 867         server->secmech.sdeschmacmd5 = NULL;
 868         kfree(server->secmech.sdescmd5);
 869         server->secmech.sdescmd5 = NULL;
 870 }